Jm. Ruggieri et al., ACCOUNTING FOR STRONG LOCALIZED HETEROGENEITIES AND LOCAL TRANSPORT EFFECT IN-CORE CALCULATION, Nuclear science and engineering, 124(1), 1996, pp. 82-88
Two methods based on the variational nodal transport method have been
developed to account for localized heterogeneities and local transport
effects in full core calculations. A local mesh refinement technique
relies on using the projected partial ingoing surface currents produce
d during coarse-mesh iterations as boundary conditions for fine-mesh c
alculations embedded within the coarse-mesh calculations. The outgoing
fine-mesh partial currents are averaged to serve in the coarse-mesh i
terations. Then, a mired transport-diffusion method using two levels o
f angular approximations for the surface partial currents depending on
the node considered has been implemented to account for local transpo
rt effects in full core diffusion calculations. These methods have bee
n tested for a model of the Superphenix complementary shutdown rods.